[PATCH] r/o bind mounts: get callers of vfs_mknod/create/mkdir()

This takes care of all of the direct callers of vfs_mknod().
Since a few of these cases also handle normal file creation
as well, this also covers some calls to vfs_create().

So that we don't have to make three mnt_want/drop_write()
calls inside of the switch statement, we move some of its
logic outside of the switch and into a helper function
suggested by Christoph.

This also encapsulates a fix for mknod(S_IFREG) that Miklos
found.

[AV: merged mkdir handling, added missing nfsd pieces]

Acked-by: Al Viro <viro@ZenIV.linux.org.uk>
Signed-off-by: Christoph Hellwig <hch@infradead.org>
Signed-off-by: Dave Hansen <haveblue@us.ibm.com>
Signed-off-by: Andrew Morton <akpm@linux-foundation.org>
Signed-off-by: Al Viro <viro@zeniv.linux.org.uk>

diff --git a/fs/namei.c b/fs/namei.c
index 89ef317..3fbcf20 100644 (file)
--- a/fs/namei.c
+++ b/fs/namei.c
@@ -1984,6 +1984,23 @@ int vfs_mknod(struct inode *dir, struct dentry *dentry, int mode, dev_t dev)
        return error;
 }
 
+static int may_mknod(mode_t mode)
+{
+       switch (mode & S_IFMT) {
+       case S_IFREG:
+       case S_IFCHR:
+       case S_IFBLK:
+       case S_IFIFO:
+       case S_IFSOCK:
+       case 0: /* zero mode translates to S_IFREG */
+               return 0;
+       case S_IFDIR:
+               return -EPERM;
+       default:
+               return -EINVAL;
+       }
+}
+
 asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode,
                                unsigned dev)
 {
@@ -2002,12 +2019,19 @@ asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode,
        if (error)
                goto out;
        dentry = lookup_create(&nd, 0);
-       error = PTR_ERR(dentry);
-
+       if (IS_ERR(dentry)) {
+               error = PTR_ERR(dentry);
+               goto out_unlock;
+       }
        if (!IS_POSIXACL(nd.path.dentry->d_inode))
                mode &= ~current->fs->umask;
-       if (!IS_ERR(dentry)) {
-               switch (mode & S_IFMT) {
+       error = may_mknod(mode);
+       if (error)
+               goto out_dput;
+       error = mnt_want_write(nd.path.mnt);
+       if (error)
+               goto out_dput;
+       switch (mode & S_IFMT) {
                case 0: case S_IFREG:
                        error = vfs_create(nd.path.dentry->d_inode,dentry,mode,&nd);
                        break;
@@ -2018,14 +2042,11 @@ asmlinkage long sys_mknodat(int dfd, const char __user *filename, int mode,
                case S_IFIFO: case S_IFSOCK:
                        error = vfs_mknod(nd.path.dentry->d_inode,dentry,mode,0);
                        break;
-               case S_IFDIR:
-                       error = -EPERM;
-                       break;
-               default:
-                       error = -EINVAL;
-               }
-               dput(dentry);
        }
+       mnt_drop_write(nd.path.mnt);
+out_dput:
+       dput(dentry);
+out_unlock:
        mutex_unlock(&nd.path.dentry->d_inode->i_mutex);
        path_put(&nd.path);
 out:
@@ -2083,7 +2104,12 @@ asmlinkage long sys_mkdirat(int dfd, const char __user *pathname, int mode)
 
        if (!IS_POSIXACL(nd.path.dentry->d_inode))
                mode &= ~current->fs->umask;
+       error = mnt_want_write(nd.path.mnt);
+       if (error)
+               goto out_dput;
        error = vfs_mkdir(nd.path.dentry->d_inode, dentry, mode);
+       mnt_drop_write(nd.path.mnt);
+out_dput:
        dput(dentry);
 out_unlock:
        mutex_unlock(&nd.path.dentry->d_inode->i_mutex);

diff --git a/fs/nfsd/nfs4recover.c b/fs/nfsd/nfs4recover.c
index 4e77a1a..145b3c8 100644 (file)
--- a/fs/nfsd/nfs4recover.c
+++ b/fs/nfsd/nfs4recover.c
@@ -155,7 +155,11 @@ nfsd4_create_clid_dir(struct nfs4_client *clp)
                dprintk("NFSD: nfsd4_create_clid_dir: DIRECTORY EXISTS\n");
                goto out_put;
        }
+       status = mnt_want_write(rec_dir.path.mnt);
+       if (status)
+               goto out_put;
        status = vfs_mkdir(rec_dir.path.dentry->d_inode, dentry, S_IRWXU);
+       mnt_drop_write(rec_dir.path.mnt);
 out_put:
        dput(dentry);
 out_unlock:

diff --git a/fs/nfsd/vfs.c b/fs/nfsd/vfs.c
index efff58a..14d5824 100644 (file)
--- a/fs/nfsd/vfs.c
+++ b/fs/nfsd/vfs.c
@@ -1255,23 +1255,35 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
        err = 0;
        switch (type) {
        case S_IFREG:
+               host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
+               if (host_err)
+                       goto out_nfserr;
                host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
                break;
        case S_IFDIR:
+               host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
+               if (host_err)
+                       goto out_nfserr;
                host_err = vfs_mkdir(dirp, dchild, iap->ia_mode);
                break;
        case S_IFCHR:
        case S_IFBLK:
        case S_IFIFO:
        case S_IFSOCK:
+               host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
+               if (host_err)
+                       goto out_nfserr;
                host_err = vfs_mknod(dirp, dchild, iap->ia_mode, rdev);
                break;
        default:
                printk("nfsd: bad file type %o in nfsd_create\n", type);
                host_err = -EINVAL;
+               goto out_nfserr;
        }
-       if (host_err < 0)
+       if (host_err < 0) {
+               mnt_drop_write(fhp->fh_export->ex_path.mnt);
                goto out_nfserr;
+       }
 
        if (EX_ISSYNC(fhp->fh_export)) {
                err = nfserrno(nfsd_sync_dir(dentry));
@@ -1282,6 +1294,7 @@ nfsd_create(struct svc_rqst *rqstp, struct svc_fh *fhp,
        err2 = nfsd_create_setattr(rqstp, resfhp, iap);
        if (err2)
                err = err2;
+       mnt_drop_write(fhp->fh_export->ex_path.mnt);
        /*
         * Update the file handle to get the new inode info.
         */
@@ -1359,6 +1372,9 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
                v_atime = verifier[1]&0x7fffffff;
        }
        
+       host_err = mnt_want_write(fhp->fh_export->ex_path.mnt);
+       if (host_err)
+               goto out_nfserr;
        if (dchild->d_inode) {
                err = 0;
 
@@ -1390,12 +1406,15 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
                case NFS3_CREATE_GUARDED:
                        err = nfserr_exist;
                }
+               mnt_drop_write(fhp->fh_export->ex_path.mnt);
                goto out;
        }
 
        host_err = vfs_create(dirp, dchild, iap->ia_mode, NULL);
-       if (host_err < 0)
+       if (host_err < 0) {
+               mnt_drop_write(fhp->fh_export->ex_path.mnt);
                goto out_nfserr;
+       }
        if (created)
                *created = 1;
 
@@ -1420,6 +1439,7 @@ nfsd_create_v3(struct svc_rqst *rqstp, struct svc_fh *fhp,
        if (err2)
                err = err2;
 
+       mnt_drop_write(fhp->fh_export->ex_path.mnt);
        /*
         * Update the filehandle to get the new inode info.
         */

diff --git a/net/unix/af_unix.c b/net/unix/af_unix.c
index 2851d0d..1454afc 100644 (file)
--- a/net/unix/af_unix.c
+++ b/net/unix/af_unix.c
@@ -819,7 +819,11 @@ static int unix_bind(struct socket *sock, struct sockaddr *uaddr, int addr_len)
                 */
                mode = S_IFSOCK |
                       (SOCK_INODE(sock)->i_mode & ~current->fs->umask);
+               err = mnt_want_write(nd.path.mnt);
+               if (err)
+                       goto out_mknod_dput;
                err = vfs_mknod(nd.path.dentry->d_inode, dentry, mode, 0);
+               mnt_drop_write(nd.path.mnt);
                if (err)
                        goto out_mknod_dput;
                mutex_unlock(&nd.path.dentry->d_inode->i_mutex);